Art, assuming a behind the nock straight down the pipe mechanical release (which is what I bet 90%+ of the posters here are using), you seem to be making a case for using the stiffest shaft you can find that suits your weight requirement.

Theoretically, the stiffer spine will stabilize much quicker and receive/retain more energy, maximizing it's penetration capability.

That's the way I've always understood it after reading it at Bob Ragsdale's site years ago...